docs: def body(self):
          """Return the message body, unencoded if needed,
          deserialized if possible.
  
          :rtype: any
  
          """
          if self._message_body:  # If already set, return it
              return self._message_body
          self._message_body = self._maybe_decompress_body()
          self._message_body = self._maybe_deserialize_body()
          return self._message_body